Search found 787 matches

by tokra
Thu Oct 12, 2017 8:28 am
Forum: Games
Topic: Trying to load Doom but need help please
Replies: 8
Views: 185

Re: Trying to load Doom but need help please

The Memtest really only works if 35K RAM is installed. It is not optimized for other use cases. The crosstalk you see with the 3K+16K RAM cart would suggest that it makes the memory visible at BOTH places and that will not work if you have another expander in your system. You need to make sure that ...
by tokra
Thu Oct 12, 2017 2:57 am
Forum: Games
Topic: Trying to load Doom but need help please
Replies: 8
Views: 185

Re: Trying to load Doom but need help please

Memtest, when run, says "Filling memory" "Please wait 7 minutes" Then it says "Error in 1024" "Break in 70" This means that the 3K-RAM-expansion does not work as it should. Maybe you did not activate the slot correctly in the port-expander or the 3K-expansion...
by tokra
Wed Oct 11, 2017 1:42 am
Forum: Games
Topic: Trying to load Doom but need help please
Replies: 8
Views: 185

Re: Trying to load Doom but need help please

Please try running a memory test and a crosstalk-test first: http://www.tokra.de/vic/doom/memtest.prg The memory-test checks the whole 35K expansion and may take some time. http://www.tokra.de/vic/doom/crosstalk.prg You shoud run the crosstalk-test several times since it is possible it does not reco...
by tokra
Tue Sep 26, 2017 5:14 am
Forum: General Topics
Topic: Utimem or Final Expansion?
Replies: 16
Views: 323

Re: Utimem or Final Expansion?

I use the MegaCart + SD2IEC combination as well and this just works fantastic. Especially having SJLOAD hidden in the IO2/3-area from startup on MegaCart works great in combination with the SD-card. On the question what to get NOW I would suggest the Penultimate Cart . It has the full 35K-expansion ...
by tokra
Tue Sep 05, 2017 12:36 am
Forum: Games
Topic: VIC Game Club No. 9 – Arcade Racers
Replies: 27
Views: 509

Re: VIC Game Club No. 9 – Arcade Racers

akator wrote:Agreed, a smooth Sprint-like game on the VIC would be very welcome.

The closest one if probably "Circle Circuit":

viewtopic.php?f=10&t=5399&start=24
by tokra
Sun Sep 03, 2017 11:20 am
Forum: General Topics
Topic: New VIC Cartridge Cases from Sharewareplus
Replies: 12
Views: 296

Re: New VIC Cartridge Cases from Sharewareplus

Could buy this item just fine right now (to Germany). Seems like it was a single piece. I see they are listed here now as well:

https://www.thefuturewas8bit.com/index. ... cases.html
by tokra
Sat Aug 26, 2017 6:01 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

We need a "VIC raster explorer"… Sounds like your next project :D To be fair: The VICE-emulation is already 99.9% perfect, apart from the interlace-modes of the NTSC-variant [*] it has no issues with any existing software of the last 36 years that I know of. It's quite astonishing that be...
by tokra
Fri Aug 25, 2017 3:57 pm
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

I couldn't resist and wrote a test-program for the $9000 phenomenon: Download Download Source PAL-VIC20 with at least +8K required. First the program fills the screen with the characters from 0 to 255 twice (just 506 visible, screen ratio still 22 x 23 chars) Then it synchronizes with the raster bre...
by tokra
Fri Aug 25, 2017 2:28 pm
Forum: Programming
Topic: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)
Replies: 6
Views: 651

Re: 320x200 - a CGA emulator for VIC-20! (+35K RAM req'd)

Neat! This would have been a good starting point for my "VIC Hunt"-picture which uses exactly the same "pixel"-size (2 wide, 3 high) :D
by tokra
Fri Aug 25, 2017 2:55 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

I've played around with ex4.prg a little and found that when using the VICE-monitor to change the value you write to $9000 a little I get a result which looks a lot closer to the real machine. Specifically you write $3f to $9000 at $2257. If I change this value to $44 in the VICE-monitor (>2256 44) ...
by tokra
Thu Aug 24, 2017 3:17 am
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

Coming back to the original problem, I get different effects on the real machine, VICE and yet another different output on z64k.com - the newest VIC-20 emulator. Something real odd is going on here obviously, as the VIC-emulation of VICE has been spot-on until now and all of PWP's demos work fine. b...
by tokra
Mon Aug 21, 2017 4:47 pm
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

(there's still a subtle difference in VICE, it allows for 2-pixel accuracy in the horizontal register whereas real h/w only delivers 4-pixel accuracy), which was anyhow good enough to design MINISKETCH in VICE. Is there already a bug-report for this? I'm sure this would be an easy fix in VICE. Rega...
by tokra
Mon Aug 21, 2017 10:06 am
Forum: Programming
Topic: Custom Char Set and Memory
Replies: 3
Views: 103

Re: Custom Char Set and Memory

There is no RAM under ROM on the VIC-20. That is a special feature of the 6510. On the VIC-20 you can only put custom chars (and the video-RAM) in the RAM-area of the unexpanded VIC ($0000-$03ff and $1000-$1fff). The first 1K-area at $0000-$03ff does not make a lot of sense for custom chars in most ...
by tokra
Sun Aug 20, 2017 3:39 pm
Forum: Programming
Topic: Raster split and $9002
Replies: 48
Views: 858

Re: Raster split and $9002

I don't know why Marko's 'paper' still is used as reference. His code takes *ages* to do the initial sync of the timer, with a linear search process; he uses two timers, where one is entirely sufficient; and finally the interrupt delay compensation is overly complicated yet it still doesn't work in...
by tokra
Sun Aug 20, 2017 3:57 am
Forum: Announcement Board
Topic: VIC-20 Software Releases of 2017
Replies: 14
Views: 2553

Re: VIC-20 Software Releases of 2017

Name : VIC Hunt Author : tokra Released : Aug, 19th 2017 at the Freestyle Graphics Competition at Evoke 2017 (got 8th place out of 26) Requirements : PAL VIC-20 with at least 8K RAM-expansion to view the image (+32K for using fcbpaint) Description : A hand-pixelled conversion of a scene from the NE...

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